Most people approach a car loan refinance the same way they approached the original loan. They find a rate that looks lower than what they have, apply, and hope for the best. That works sometimes. But it also leads to surprises, like finding out your vehicle does not qualify, or discovering the fees eat up most of the savings, or locking in a rate that restarts years of front-loaded interest.
This checklist runs through everything worth checking before you submit a single application. It takes about an hour to work through properly, and it will save you from the most common refinance mistakes.
Get your actual payoff figure
This is the most important number in the whole process, and most people do not have it.
The balance showing in your lender’s app is not the payoff figure. The payoff figure includes interest that has accrued since your last payment and any fees required to close the loan. It is the exact amount a new lender would need to send to pay off your old loan today.
Call your current lender or log into their portal and request a 10-day payoff quote. They will give you a specific dollar amount and an expiration date. That is the number you plug into the refinance calculator, not the app balance.
Pull your Truth in Lending disclosure
Your original loan came with a Truth in Lending disclosure. It shows your APR, how interest is calculated, whether there is a prepayment penalty, and the total amount you will pay over the life of the loan.
Two things to look for specifically. First, check whether your loan uses simple interest or the Rule of 78s. Simple interest means you only pay interest on the remaining balance, so a refinance works the way you expect. The Rule of 78s front-loads interest much more heavily and can make refinancing much less valuable depending on where you are in the loan.
Second, check for prepayment penalties. Some lenders charge a fee if you pay off the loan early. If yours does, that fee goes into your break-even calculation.
Check your credit score before anyone else does
Do not let a lender be the first one to see your credit score during this process. Check it yourself first using a free tool. Credit Karma gives you a VantageScore, which is close enough to orient yourself. If you can get your FICO score through your bank or credit card issuer, even better, since auto lenders typically use FICO.
Knowing your score before you apply tells you which lender tier you are likely to fall into and what rate range to expect. It also tells you whether waiting a few months to improve your score might be worth it before you refinance.
Know your credit tier and what rates it gets you
Lenders group borrowers into tiers and each tier gets a different rate range. A rough breakdown based on current market conditions:
Scores above 750 typically see rates in the 5 to 6.5 percent range. Scores between 700 and 749 usually land in the 6.5 to 8 percent range. Scores between 640 and 699 typically see rates from 8 to 12 percent. Below 640, rates can go significantly higher and lender options narrow quickly.
If your score is sitting just below a tier threshold, say 698 instead of 700, it may be worth spending 60 to 90 days paying down credit card balances before refinancing. Moving up one tier can be worth more than whatever savings you would get by refinancing today.
Calculate your loan-to-value ratio
Lenders care about how much you owe relative to what your car is worth. That ratio is called LTV, or loan-to-value. The formula is simple: divide your loan balance by the current market value of the vehicle, then multiply by 100.
Most prime lenders want to see an LTV below 100 percent, meaning you owe less than the car is worth. Some will go up to 120 percent for qualified borrowers. Above that, your options shrink considerably.
To get a conservative vehicle value, use a wholesale or trade-in estimate from Kelley Blue Book or NADA rather than the private sale value. Lenders use wholesale numbers during underwriting, not retail.
If your LTV is too high, a lump sum payment toward the principal before you apply can sometimes clear the threshold and unlock better pricing.
Calculate whether the rate difference is worth it
A lower rate does not automatically mean a refinance is worth doing. You need to know how much lower.
For most mid-size loans, a rate drop of at least 1.5 to 2 percentage points is generally enough to justify the fees and process. On a larger loan, even 1 percentage point can be meaningful in dollar terms.
Run your numbers through the refinance calculator using your actual payoff figure, current APR, and remaining term. Then enter the rate you expect to qualify for based on your credit tier. The calculator will show you the monthly savings and the break-even point.
Add up every fee before you compare offers
The monthly savings number means nothing until you factor in the cost of the refinance. Common fees include title transfer fees, origination fees, registration fees in some states, and any prepayment penalty on your current loan.
Add all of these together and divide by your monthly savings. That gives you the break-even period in months. If the break-even is under 12 months and you plan to keep the car well past that, the refinance makes sense. If it is pushing toward 18 to 24 months, the deal is marginal and worth comparing against more lender quotes before committing.
Get quotes from at least three lenders
One quote is not a market. It is one data point.
Get quotes from at least three different lender types. A credit union tends to have the lowest rates. An online lender tends to move faster. A national bank tends to be more consistent in its underwriting. Comparing all three gives you a real picture of what the market will offer you.
Use soft pull pre-qualification wherever it is available so you can compare rates without affecting your credit score. Once you have narrowed it down to the lender you want, then allow the hard pull.
Ask every lender for a rate lock
Market rates move. An approval process that takes two to three weeks is plenty of time for rates to shift against you. A lender who quotes you 6.2 percent today may fund your loan at a different rate if they do not lock it.
Ask specifically whether they offer a rate lock and how long it lasts. Get the answer in writing if possible. If a lender cannot or will not lock your rate, factor that risk into your decision.
Think about your holding horizon
The last check is simple but often skipped. How long do you actually plan to keep this car?
If your break-even is 10 months and you are planning to sell the car in 8 months, the refinance costs you money even if the rate is better. The savings only materialize if you hold the loan past the break-even point.
If you are not sure how long you will keep the car, err on the side of caution with longer break-even periods and prioritize lenders with no prepayment penalties so you are not locked in if your situation changes.
The short version
Get your payoff figure in writing. Check your credit before anyone else does. Know your LTV. Run the break-even math with real numbers. Get three quotes. Ask for a rate lock. Make sure you are keeping the car long enough for the savings to matter.
That is the whole checklist. If all ten boxes check out, the refinance almost certainly makes sense. If one or two do not, this process tells you exactly what needs to change before you apply.
Use the calculator on this site to run your numbers before you do anything else.
Last reviewed: March 2026. Rate tier benchmarks sourced from Experian Automotive Finance Market reports and CFPB Consumer Credit data.